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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of mouse Dnmt1 knockouts and TSA treated p53-/- and p53-/-Dnmt1-/- cells to investigate the role of DNA methylation in stable gene repression

ABSTRACT: The experiment was designed to study the effects of the Dnmt1 gene knockout on gene expression, as well as to analyze the effects of TSA treatment on both WT (p53-/-) and knockout (p53-/-Dnmt1-/-) cells ; The effect of TSA treatment on knockout and WT cells was tested at two different time points (24 and 48 hs), as well as two weeks after removal of TSA Experiment Overall Design: Seven hybridizations were performed: 1. p53-/- untreated (control), 2. p53-/- +TSA harvested after 24hs of exposure to TSA, 3. p53-/- +TSA 48hs, 4. p53-/-Dnmt1-/- untreated, 5.p53-/-Dnmt1-/- +TSA 24hs 6.p53-/-Dnmt1-/- +TSA 48hs 7.p53-/-Dnmt1-/- two weeks after removal of TSA

ORGANISM(S): Mus musculus

SUBMITTER: Laura Lande-Diner

PROVIDER: E-GEOD-3534 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Role of DNA methylation in stable gene repression.

Lande-Diner Laura L Zhang Jianmin J Ben-Porath Ittai I Amariglio Ninette N Keshet Ilana I Hecht Merav M Azuara Veronique V Fisher Amanda G AG Rechavi Gideon G Cedar Howard H

The Journal of biological chemistry 20070220 16

A large fraction of the animal genome is maintained in a transcriptionally repressed state throughout development. By generating viable Dnmt1(-)(/)(-) mouse cells we have been able to study the effect of DNA methylation on both gene expression and chromatin structure. Our results confirm that the underlying methylation pattern has a profound effect on histone acetylation and is the major effector of me-H3(K4) in the animal genome. We demonstrate that many methylated genes are subject to addition ...[more]

PMID: 17311920

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Role of DNA methylation in stable gene repression

Project description:The experiment was designed to study the effects of the Dnmt1 gene knockout on gene expression, as well as to analyze the effects of TSA treatment on both WT (p53-/-) and knockout (p53-/-Dnmt1-/-) cells The effect of TSA treatment on knockout and WT cells was tested at two different time points (24 and 48 hs), as well as two weeks after removal of TSA Keywords: Effect of demetyhlation and/or reacetylation on gene expression

2007-03-06 | GSE3534 | GEO

Gene expression analysis of RNAs isolated from TSA-untreated and TSA-treated human keratinocytes

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TSA induced gene expression variation on breast cancer cell SKBR3

Project description:To explore TSA influence on human breast cancer cells, we attempt to analyze genes differentially expressed between TSA treated and untreated SKBR3 cells, which will hopefully provide clues for TSA target genes.

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Gene expression analysis of RNAs isolated from TSA-untreated and TSA-treated human keratinocytes

Project description:Gene expression analysis of RNAs isolated from TSA-untreated and TSA-treated human keratinocytes

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Effect of HDAC inhibitor TSA on haploid embryogenesis [dataset 1]

Project description:Haploid embryos can be induced from cultured immature pollen following a stress treatment. In Brassica napus, application of the histone/lysine deacetylase (HDAC/KDAC) inhibitor trichostatin A (TSA) to pollen cultures enhances the production of differentiated embryos and embryogenic callus when applied together with heat stress (Li et al., 2014). To identify genes associated with the induction of B. napus haploid embryogenesis, we compared the transcriptomes of untreated pollen cultures and pollen cultures treated with either heat-stress or heat-stress plus TSA.

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Transcription profiling of Arabidopsis treated with Trichostatin A (TSA) to inhibit of histone deacetylase in Arabiodopsis thaliana

Project description:Histone acetylation is involved in the regulation of gene expression in plants and eukaryotes. Histone deacetylases (HDACs) are enzymes that catalyze the removal of acetyl groups from histones, which is associated with the repression of gene expression. To study the role of histone acetylation in the regulation of gene expression during seed germination, trichostatin A (TSA), a specific inhibitor of histone deacetylase, was used to treat imbibing Arabidopsis thaliana seeds. GeneChip arrays were used to show that TSA induces up-regulation of 45 genes and down-regulation of 27 genes during seed germination. Eight TSA-up-regulated genes were selected for further analysis - RAB18, RD29B, ATEM1, HSP70 and four late embryogenesis abundant protein genes (LEA). A gene expression time course shows that these eight genes are expressed at high levels in the dry seed and repressed upon seed imbibition at an exponential rate. In the presence of TSA, the onset of repression of the eight genes is not affected but the final level of repressed expression is elevated. Chromatin immunoprecipitation and HDAC assays show that there is a transient histone deacetylation event during seed germination at one day after imbibition, which serves as a key developmental signal that affects the repression of the eight genes. Experiment Overall Design: Two samples (TSA-treated v.s. untreated). Two replicates for each sample.

2008-06-12 | E-GEOD-3783 | biostudies-arrayexpress

Transcription profiling of Arabidopsis seed germination in presence and absence of histone deaceatylase inhibitor, Trichostain A (TSA).

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2008-06-12 | E-GEOD-3784 | biostudies-arrayexpress

Dnmt1 has de novo activity targeted to transposable elements

Project description:DNA methylation plays a critical role in development, particularly in repressing retrotransposons. The mammalian methylation landscape is dependent on the combined activities of the canonical maintenance enzyme Dnmt1 and the de novo Dnmts, 3a and 3b. Here we demonstrate that Dnmt1 displays de novo methylation activity in vitro and in vivo with specific retrotransposon targeting. We used whole-genome bisulfite and long-read Nanopore sequencing in genetically engineered methylation depleted embryonic stem cells to provide an in-depth assessment and quantification of this activity. Utilizing additional knockout lines and molecular characterization, we show that Dnmt1's de novo methylation activity depends on Uhrf1 and its genomic recruitment overlaps with targets that enrich for Trim28 and H3K9 trimethylation. Our data demonstrate that Dnmt1 can de novo add and maintain DNA methylation, especially at retrotransposons and that this mechanism may provide additional stability for long-term repression and epigenetic propagation throughout development.

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MethylationEPIC array of DNMT1 inhibitor treated AML cell lines - part II

Project description:Genome wide demethylation by DNMT1 inhibitor GSK3484862 results in up-regulation of epigenetically-silenced genes. Methylation was assayed for each cell line following DNMT1 inhibitor or vehicle treatment. Global methylation distributions were compared between treated and untreated samples.

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5Aza and TSA treatment of MCF7 cells (RNA-seq)

Project description:The goal of this study is to identify the gene expression changes caused by exposure of to the DNMT inhibitor 5-aza-2'-deoxycytidine (5Aza) and HDAC inhibitor Trichostatin A (TSA). We performed rRNA-depleted RNA sequencing of the untreated and drug-treated MCF7 breast cancer cell lines and carried out differential gene expression analysis. Although 5Aza caused a stranger demethylation effect than TSA, there were fewer differentially expressed gene in the 5Aza-treated MCF7 than the TSA-treated cells.

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